[Libguestfs] [PATCH 0/3] Add discard support.

These patches contain the beginnings of discard (a.k.a. trim or unmap) support. This will allow us to change virt-sparsify to work on disk images in-place (instead of using slow & inefficient copying). The approach used is to add an optional 'discard' parameter to add-drive. It has 3 possible settings: - 'disable' : the default, no discard is done - 'besteffort' : try to enable it, but don't fail if it's not supported - 'enable' : enable it, and fail if it is not supported I'm not sure if we should wait for post-1.26 before adding discard support. It depends if the interface above is suitable or if we'll have to change it later. However I discussed how to support this at DevConf and this approach was generally agreed. Rich.